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What is the difference between the valve positioner and the actuator

Column：Technical article Time：2017-11-11
Valve positioner is the main control valve accessories, and pneumatic control valve greatly supporting the use of it to accept the regulator output signal, and then use its output signal to control the pneumatic regulator valve...

Valve positioner is the main control valve accessories, and pneumatic control valve greatly supporting the use of it to accept the regulator output signal, and then use its output signal to control the pneumatic regulator valve, when the valve action, the valve stem displacement and through Mechanical feedback to the valve positioner, valve position conditions through the electrical signal to the host system.

Valve positioner according to its structure and working principle can be divided into pneumatic valve positioner, electric - gas valve positioner and intelligent valve positioner.
The valve positioner can increase the output power of the regulating valve, reduce the transmission delay of the regulating signal, speed up the movement of the valve stem, improve the linearity of the valve, overcome the friction force of the valve stem and eliminate the influence of imbalance force, so as to ensure the regulation Correct positioning of the valve.